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乙二醇与柠檬酸摩尔比及pH值对采用佩琴尼法合成的TiO和CuO粉末的形貌、振动、光学及电子性质的影响

Effect of Ethylene Glycol: Citric Acid Molar Ratio and pH on the Morphology, Vibrational, Optical and Electronic Properties of TiO and CuO Powders Synthesized by Pechini Method.

作者信息

Vargas-Urbano Mónica A, Marín Lorena, Castillo Winny Mónica, Rodríguez Luis Alfredo, Magén César, Manotas-Albor Milton, Diosa Jesús Evelio, Gross Katherine

机构信息

Grupo de Transiciones de Fase y Materiales Funcionales (GTFMF), Departamento de Física, Universidad del Valle, Cali A.A. 25360, Colombia.

Grupo CYTEMAC, Departamento de Física, Universidad del Cauca, Popayán 190003, Colombia.

出版信息

Materials (Basel). 2022 Jul 30;15(15):5266. doi: 10.3390/ma15155266.

DOI:10.3390/ma15155266
PMID:35955201
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9369947/
Abstract

High-purity TiO and CuO powders were synthesized by the Pechini method, an inexpensive and easy-to-implement procedure to synthetize metal oxides. The variables of synthesis were the ethylene glycol:citric acid molar ratio and the pH. High reproducibility of the anatase and tenorite phase was obtained for all synthesis routes. The degree of purity of the powders was confirmed by XRD, FTIR, UV-Vis absorption and XPS spectra. SEM and TEM images revealed the powders are composed of micrometer grains that can have a spherical shape (only in the TiO) or formed by a non-compacted nanocrystalline conglomerate. FTIR spectra only displayed vibrational modes associating TiO and CuO with nanoparticle behavior. UV-Vis absorption spectra revealed the values of maximum absorbance percentage of both systems are reached in the ultraviolet region, with percentages above 83% throughout the entire visible light spectrum for the CuO system, a relevant result for solar cell applications. Finally, XPS experiments allow the observation of the valence bands and the calculation of the energy bands of all oxides.

摘要

采用佩琴尼法合成了高纯度的二氧化钛（TiO）和氧化铜（CuO）粉末，这是一种合成金属氧化物的廉价且易于实施的方法。合成变量为乙二醇与柠檬酸的摩尔比以及pH值。所有合成路线均获得了高重复性的锐钛矿相和板钛矿相。通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、紫外可见吸收光谱和X射线光电子能谱（XPS）对粉末的纯度进行了确认。扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像显示，这些粉末由微米级颗粒组成，这些颗粒可能呈球形（仅在TiO中）或由非致密的纳米晶聚集体形成。FTIR光谱仅显示了与纳米颗粒行为相关的TiO和CuO的振动模式。紫外可见吸收光谱表明，两个体系的最大吸光度百分比值均在紫外区域达到，对于CuO体系，在整个可见光谱范围内百分比均高于83%，这对于太阳能电池应用是一个重要结果。最后，XPS实验能够观察到所有氧化物的价带并计算其能带。

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本文引用的文献

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